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15.10.1. HRV/ERV heating operation for MXZ system
When using an HRV/ERV, please take appropriate consideration when operating it during heating.
Model
MXZ-3C24/3C30/4C36/5C42NA3
MXZ-3C24/3C30NAHZ3
MXZ-SM36/42/60NAM
MXZ-SM36/42/48NAMHZ
15.11. Humidifier
Humidifier
Humidifier Control
Sequence of operation:
1. The humidistat closes CNF.
2. The furnace blower turns on.
3. CN25 provides 12 VDC to turn on the humidifier (do not exceed 1 watt draw per relay).
4. When the humidistat opens CNF, the furnace blower continues to run for 30 seconds to clear the
ductwork of moist air.
5. If defrost starts during humidifier operation, CN25 de-energizes.
Humidistat:
• Non-voltage a-contact input
• Contact rating voltage >=15 VDC
• Contact Rating Current >= 0.1 A
• Minimum Applicable Load =< 1mA at DC
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
Part Number: CN24RELAY-KIT-CM3
12vdc
coil
Humidistat (field)
max 30 ft.
92
Description
When the furnace blower is moving air for
HRV/ERV operation, the unit may provide warm
air to the occupied space, even in Thermo-Off
mode.
Control Board in Control Box
Control Box
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